KR102032840B1 - Manufacturing method of inorganic heat insulating board using magnesium sulfate inorganic binder - Google Patents

Abstract

The present invention provides a method for producing an inorganic insulation board using a magnesium sulfate inorganic binder (a) adding a magnesium sulfate to water and heating to prepare a mixture; (b) a mixing step of preparing an inorganic binder by adding a silicate solution to the prepared mixture; (c) a primary molding step of kneading the magnesium oxide into the prepared inorganic binder; (d) a secondary molding step of increasing the thermal insulation performance by mixing pearlite with the inorganic insulating material manufactured by the primary molding; And (e) it can provide a method for producing an inorganic insulating board using a magnesium sulfate inorganic binder comprising a drying step of putting the inorganic insulating material prepared by the secondary molding into a mold, and pressurized to dry at room temperature.
In addition, it is possible to provide an inorganic insulation board manufactured by the above manufacturing method.

Description

Manufacturing method of inorganic heat insulating board using magnesium sulfate inorganic binder}

The present invention relates to a method for manufacturing an inorganic insulating board using a magnesium sulfate inorganic binder and to an inorganic insulating board manufactured by the same. More particularly, by manufacturing an inorganic binder with magnesium sulfate, the durability is improved compared to the existing inorganic binder and high thermal The present invention relates to a method for manufacturing an inorganic insulation board using a magnesium sulfate inorganic binder and to an inorganic insulation board manufactured thereby.

In general, building, for example, apartments, multi-storey buildings, etc. are required in the reality that the size of the building is required to be enlarged, advanced, and functionalized according to the improvement of living standards, the advancement of the knowledge industry, and the absolute necessity of the residential space corresponding to the rapidly changing environment of the information society. High-rise and large-scaled development are inevitable reality.

Therefore, researches and efforts to develop materials that satisfy light weight, nonflammability, sound insulation, and thermal insulation at the same time have been continued, and in response to these demands, porous building materials are being developed in various fields. .

The building materials developed so far have been applied to the production of styrofoam, urethane, asbestos or gypsum board, but the building materials as described above had problems such as light weight, nonflammability, sound insulation, and thermal insulation.

First, the urethane products made of styrofoam and urethane are excellent in thermal insulation to defend against cold air and block internal heat to the outside due to the air inside, while blocking the outside hot air in summer The indoor temperature is cool due to the difference in temperature inside, but it is relatively weak in heat and toxic gas is ejected in the event of fire, resulting in very high casualties. Urethane foam also has lower ignition speed than styrofoam, but black smoke and harmful gases after ignition. There was a vulnerability to be discharged, there was a problem with heavy weight.

Gypsum board, which is used for interior walls, partitions, and ceilings because of its excellent heat resistance and durability, is a plate-shaped pre-axial interior material sandwiching gypsum between two sheets of paper (or other fiber material). It is a kind.

However, the use of the gypsum board is gradually reduced due to heavy weight, poor elasticity and strength and brittleness, and the use of inorganic boards using expanded vermiculite, expanded pearlite, and inorganic binder is rapidly increasing. to be.

However, all of the conventional inorganic boards use liquid sodium silicate (water glass) as the inorganic binder, and various reinforcing materials are used here. The liquid sodium silicate (water glass) has good initial adhesiveness but is very vulnerable to moisture, and thus sodium ions. Reaction with water or water in the air to produce sodium hydroxide has a problem that is changed to hydrophilic and the strength is weakened rapidly by moisture.

To compensate for this, the liquid sodium silicate (water glass) must react with sulfuric acid, nitric acid, or phosphoric acid to produce a stable salt. Therefore, the amount of liquid sodium silicate (water glass) is excessively consumed, and liquid sodium silicate (water glass) is used. Since various reinforcing materials for adhesion or strength reinforcement should be used, the manufacturing process of the inorganic binder was difficult and the manufacturing cost increased.

In order to solve the above problems, the present invention by manufacturing an inorganic binder with magnesium sulfate, a method of manufacturing an inorganic insulation board using a magnesium sulfate inorganic binder to improve the durability and enable the implementation of high thermal properties compared to the existing inorganic binder And to provide an inorganic insulation board produced thereby.

In order to solve the above problems, a method of manufacturing an inorganic insulation board using a magnesium sulfate inorganic binder according to the first embodiment of the present invention (a) adding a magnesium sulfate to water and heating to prepare a mixture; (b) a mixing step of preparing an inorganic binder by adding a silicate solution to the prepared mixture; (c) a primary molding step of kneading the magnesium oxide into the prepared inorganic binder; (d) a secondary molding step of increasing the thermal insulation performance by mixing pearlite with the inorganic insulating material manufactured by the primary molding; And (e) it can provide a method for producing an inorganic insulating board using a magnesium sulfate inorganic binder comprising a drying step of putting the inorganic insulating material prepared by the secondary molding into a mold, and pressurized to dry at room temperature.

In addition, the step (a) is characterized in that the mixing ratio of the magnesium sulfate and water is 10 parts by weight to 30 parts by weight: 100 parts by weight.

In addition, the step (a) is characterized by stirring the magnesium sulfate and water at 50 to 80 ℃.

In addition, the step (b) is further mixed with the rosin solution as the silicate solution, the rosin solution is characterized in that it comprises a rosin, an organic solvent and a dispersant.

In addition, the step (b) is further mixed with a starch solution, such as the silicate solution, characterized in that the starch solution comprises gelatinized starch and dispersant.

In addition, the step (b) is characterized in that 5 to 10 parts by weight of the silicate solution is mixed with respect to the total parts by weight of the mixture.

In addition, the step (b) is characterized in that for mixing the mixture and the silicate solution at 50 to 80 ℃.

In addition, the step (c) is characterized in that 60 to 90 parts by weight of the magnesium oxide is mixed with respect to the total weight parts of the inorganic binder.

In addition, the step (d) is characterized in that 5 to 20 parts by weight of the pearlite is mixed with respect to the total parts by weight of the inorganic insulating material.

In addition, the step (d) is further mixed with an organic acid salt, such as perlite, the organic acid salt is characterized in that it is prepared through the neutralization reaction by mixing the organic acid and the base compound.

In addition, the step (d) is characterized in that the blast furnace slag fine powder further mixed with the pearlite.

In addition, the step (d) is characterized in that the natural oil is further mixed after the pearlite mixing.

In addition, the step (e) is characterized in that the inorganic insulating material prepared by the secondary molding into a mold, and pressurized at a pressure of 1 to 3MPa and dried at room temperature.

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Method for producing an inorganic insulation board using magnesium sulfate inorganic binder and an inorganic insulation board manufactured by the same according to an embodiment of the present invention by manufacturing an inorganic binder with magnesium sulfate, to improve the durability and high thermal properties compared to the existing inorganic binder It can be implemented.

1 is a flow chart schematically showing a method of manufacturing an inorganic insulation board using a magnesium sulfate inorganic binder according to a first embodiment of the present invention.
Figure 2 is a sample production photo of the inorganic insulation board prepared in Examples 1 to 4 of the present invention.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be described in detail in the text. It is to be understood, however, that the intention is not to limit the invention to the particular form disclosed and to include all modifications, equivalents, and substitutes included in the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a combination of features, numbers, steps, components, etc. described in the specification, but one or more other features or numbers, It is to be understood that the present invention does not exclude the possibility of adding or presenting a combination of steps, components, and the like.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Here, the repeated description, well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention, and detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more completely describe the present invention to those skilled in the art.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a flowchart schematically showing a method of manufacturing an inorganic insulation board using a magnesium sulfate inorganic binder according to a first embodiment of the present invention.

Referring to Figure 1, the method for producing an inorganic insulation board using a magnesium sulfate inorganic binder according to the first embodiment of the present invention, the stirring step (S10), the mixture prepared by adding magnesium sulfate to water and heating Mixing step (S20) of preparing an inorganic binder by adding a silicate solution to the mixture, putting the magnesium oxide into the prepared inorganic binder (S30), mixing pearlite to the inorganic insulating material prepared by primary molding Secondary molding step (S40) to improve the thermal insulation performance and the inorganic insulating material prepared by the secondary molding into a frame, may comprise a drying step (S50) to dry at room temperature after pressing.

First, in step S10 (stirring step), the mixture may be prepared by adding magnesium sulfate to water and dissolving it by heating.

Here, the mixing ratio of magnesium sulfate and water is preferably 10 parts by weight to 30 parts by weight: 100 parts by weight.

At this time, when magnesium sulfate is less than 10 parts by weight with respect to 100 parts by weight of water, the strength after forming the inorganic insulation board is weak and cannot be used as a building and industrial insulation board, and if it exceeds 30 parts by weight, the strength of the inorganic insulation board after molding is Although strong, the weight of the inorganic insulation board may be heavy, and the strength increase effect is insignificant compared to the weight.

In addition, magnesium sulfate and water may be stirred at 50 to 80 ° C., and a bath may be used.

At this time, the temperature of the bath water may be 50 to 80 ℃, when the temperature of the water is less than 50 ℃ may be longer to dissolve the magnesium sulfate, it is preferable to stir at the temperature of the bath not exceeding 80 ℃.

In step S20 (mixing step), the inorganic binder may be prepared by adding and mixing the silicate solution to the mixture prepared in step S10. At this time, the silicate solution may be added to the inorganic binder to increase the adhesion.

The silicate solution is aluminum silicate, 73% silicon oxide (SiO2), 17% aluminum oxide (Al2O₃3), 5% potassium oxide (K2O), 3% sodium oxide (Na20), 1% calcium oxide (CaO) It may be made of an inert nontoxic mineral.

Here, 5 to 10 parts by weight of the silicate solution may be mixed with respect to the total parts by weight of the mixture.

At this time, when the silicate solution is less than 5 parts by weight based on the total weight of the mixture, the effect of increasing the adhesion may be insignificant.

In addition, since the silicate gels when the silicate solution is added to the mixture, a process of re-stirring it to form an aqueous solution is necessary.If it exceeds 10 parts by weight, it does not take a long time to re-gel the gel to eliminate the gelation. Problems may occur.

In addition, the mixture and the silicate solution may be mixed at 50 to 80 ℃, it may be used a bath. This is to eliminate gelation of the silicate solution.

At this time, the temperature of the bath water may be 50 to 80 ℃, when proceeding at this temperature it may take less time to resolve the gelation of the precipitated silicate solution to form an aqueous solution when stirring.

That is, when the temperature of the water is less than 50 ℃ time to solve the gelation of the silicate solution may be long, and if it exceeds 80 ℃ water may evaporate to gel and harden.

In addition, step S20 (mixing step) may further mix the rosin liquid after the silicate mixing.

The rosin solution may include rosin, an organic solvent and a dispersant. The rosin may be dissolved and liquefied by dissolving the rosin in an organic solvent, and the dispersant may be mixed.

Pine Resin (松 津; 松 津) refers to the balsam that is secreted when the pine tree is damaged, also known as Songji.

Such rosin can be obtained by, for example, wounding a pine tree. The rosin is a colorless clear liquid at the time of secretion from the tree, but it is whitish and sticky over time. Such rosin is known to contain 70 to 75% by weight rosin, 18 to 22% by weight turpentine and 5 to 7% by weight water or other impurities. Rosin is composed of the above components, it is possible to provide a rosin solution excellent in waterproof and moisture-proof. As the rosin in the above, for example, a rosin distributed in the art can be purchased and used, or what is obtained by throwing raw vegetables on the pine tree may be used by filtering to remove suspended matters.

As the organic solvent, a solvent capable of dissolving rosin may be used. The organic solvent may include one or more of alcohols, ether solvents, ester solvents, aromatic solvents and ketone solvents.

That is, as the organic solvent, alcohols such as methanol, ethanol, propanol, butanol, pentanol or hexanol; Ether solvents such as dimethyl ether, diethyl ether, methyl ethyl ether, dipropyl ether, methyl propyl ether, ethyl propyl ether, dibutyl ether, methyl butyl ether, ethyl butyl ether or propyl butyl ether and the like; Ester solvents such as ethyl acetate and the like; Aromatic solvents such as benzene, toluene, xylene or naphtha; And ketone-based solvents such as acetone, methyl ethyl ketone or methyl isobutyl ketone and the like can be used alone or used in combination, but this is only one embodiment of the present invention, it can be used when the solvent to dissolve the rosin have.

By mixing the dispersant with the rosin, the water of the mixture and the organic solvent of the rosin can be mixed.

By adding such a rosin solution to the mixture, it is possible to have waterproofness and moisture resistance, and to improve the strength of the inorganic insulation board to be manufactured. That is, the manufactured inorganic insulation board can be resistant to moisture, such as mold prevention.

In addition, the rosin solution may include 200 parts by weight to 500 parts by weight of organic solvent and 3 to 5 parts by weight of dispersant based on 100 parts by weight of rosin.

Thus, when dissolving 100 parts by weight of rosin in 200 parts by weight to 500 parts by weight of an organic solvent, it is possible to produce an inorganic insulating board with high strength by rosin.

It is most preferable for the strength improvement and moisture-proofing effect to mix 15-20 weight part of rosin liquids with respect to the total weight part of mixtures.

In addition, step S20 (mixing step) may further mix the starch liquid after silicate mixing.

The starch may comprise gelatinized starch and a dispersant.

That is, when the gelatinized starch and the dispersant are mixed, crosslinking occurs, and thus the viscosity and fluidity of the inorganic insulating material prepared by adding the prepared starch solution to the mixture may be improved. Accordingly, it is easy to put the inorganic insulating material in accordance with the mold, it is possible to prevent cracks and cracks during curing.

In addition, the viscosity can be given so that each mixture is mixed well with each other.

In addition, it is most preferable for the strength improvement and the moisture-proof effect to mix 5-10 weight part of starch liquid with respect to the total weight part of mixture.

At this time, when the starch liquid is less than 5 parts by weight of the mixture, the effect of improving the fluidity of the inorganic insulating material is insignificant, and when it exceeds 10 parts by weight, problems may occur in curing and physical properties of the inorganic insulating board after molding.

In step S30 (primary molding step), the inorganic binder prepared in step S20 can be prepared by kneading magnesium oxide into an inorganic insulating material.

Here, 60 to 90 parts by weight of magnesium oxide may be mixed with respect to the total weight of the inorganic binder.

In this case, when the magnesium oxide is less than 60 parts by weight based on the total weight of the inorganic binder, the strength after forming the inorganic insulation board is weak, and when it exceeds 90 parts by weight, it is economically inefficient because it does not have an effect compared to the weight increase.

In step S40 (secondary molding step), pearlite may be mixed with the inorganic insulating material prepared in step S30. Pearlite may be mixed with the inorganic insulating material to reduce the manufacturing cost while reducing the weight of the inorganic insulating material.

Here, 5 to 20 parts by weight of pearlite may be mixed with respect to the total parts by weight of the inorganic insulating material.

At this time, when the pearlite is less than 5 parts by weight based on the total weight of the inorganic insulating material, the weight reduction effect due to the addition of pearlite is insignificant, and when the weight exceeds 20 parts by weight, the weight loss effect by the pearlite increases but the strength of the inorganic insulation board is increased. It is significantly lowered.

In addition, step S40 (secondary molding step) may be further mixed with an organic acid salt, such as perlite in the inorganic insulating material.

Organic acid salts may be prepared through a neutralization reaction by mixing an organic acid and a base compound, and are added to an inorganic binder to have an anticorrosive effect.

The organic acid may comprise one of acetic acid, formic acid, fumaric acid, fish acid, succinic acid.

The base compound may comprise one of sodium hydroxide, calcium hydroxide and potassium hydroxide.

Here, 10 to 15 parts by weight of the organic acid salt may be mixed with respect to the total weight of the inorganic insulating material.

At this time, when the organic acid salt is less than 10 parts by weight based on the total weight of the inorganic insulating material, the corrosion protection effect by the addition of the organic acid salt is insignificant, and when the organic acid salt exceeds 15 parts by weight, the thermal insulation effect may be reduced.

In addition, in step S40 (secondary molding step), the blast furnace slag fine powder, such as pearlite, may be further mixed with the inorganic insulating material.

Blast furnace slag powder is a by-product of smelting iron in the furnace and contains calcium hydroxide (CaOH ₂ ) and latent hydraulic materials. The blast furnace slag fine powder is mixed with the inorganic insulating material and reacted with the alkaline material, thereby improving the long-term strength of the manufactured inorganic insulating board.

Here, the blast furnace slag fine powder 5 to 15 parts by weight based on the total weight of the inorganic insulating material may be mixed.

At this time, if the blast furnace slag powder is less than 5 parts by weight based on the total weight of the inorganic insulating material, the effect of improving the long-term strength by the addition of the blast furnace slag is insignificant, and if it exceeds 15 parts by weight, problems may occur in the properties of the inorganic insulation board. .

In addition, the step S40 (secondary molding step) may be further mixed with natural oil after mixing pearlite, organic acid salt, blast furnace slag fine powder to the inorganic insulating material.

That is, by finally adding natural oil to the inorganic insulating material, it is possible to adjust the viscosity of the inorganic insulating material and to control the fluidity.

Accordingly, the inorganic insulating material can be easily put in accordance with the shape of the mold, and cracks and cracks can be prevented during curing.

Natural oils include avocado oil, castor oil, canola oil, Chinese wood oil, coffee oil, cottonseed or cotton oil. , Corn oil, germ oil, Japanese wood oil, jojoba oil, kaya oil, linseed oil, macadamia nut oil (macadamia) nut oil, olive oil, peanut oil, perilla oil, peric oil, rapeseed oil, rice bran oil, sesame seed Sesame seed oil, safflower oil, camellia oil, sunflower oil, sunflower oil, soybean oil, tea seed oil, camellia oil, tsubaki oil, wheat Germ oil, olive pomace oil, green tea seed oil, neem oil, walnut oil, evening primrose Flowering oil (evening primrose oil), lanolin (woolfat) oil, calendula oil, rosehip seed oil, coconut oil (coconut oil), maize oil, mustard oil ( mustard oil, kukui nut oil, tamanu oil, palm plein oil, babassu oil, palm oil, borage oil ), Palm kernel oil, apricot kernel oil, grapeseed oil, poppyseed oil, argan oil, flaxseed oil, almond Almond oil, hazelnut oil, hemp seed oil, pumpkinseed oil, triglycerol, glyceryl trioctanoate, glyceryl triiso Palmitate (glyceryl triisopalmitate), fish oils (herring oil), herring oil, salmon oil, sardine oil (s ardine oil, sharkliver oil, whale oil, egg yolk oil, lard oil, mink oil, neatsfoot oil, animal resin (tallow) It may be formed of one or more of oil, turtle oil, EMU oil, ostrich oil, but not limited thereto, and both vegetable and animal oils may be used.

Here, 3 to 7 parts by weight of the natural oil may be mixed with respect to the total parts by weight of the inorganic insulating material.

At this time, when the natural oil is less than 5 parts by weight based on the total weight of the inorganic insulating material, it may be difficult to put the inorganic insulating material in accordance with the shape of the mold due to the low fluidity, and if it exceeds 15 parts by weight to the curing and physical properties of the inorganic insulating board Problems may arise.

In step S50 (drying step), the inorganic insulating material prepared by the secondary molding can be put into the mold, and dried after pressing at room temperature.

That is, an inorganic insulating board can be manufactured by putting an inorganic insulating material prepared by secondary molding into a mold suitable for the shape to be made, pressing the pressure at 1 Ng 3 MPa pressure, and holding the shape, and drying at room temperature.

At this time, the pressurization time can be maintained by 30 to 1 hour to make a shape. Since the amount of magnesium sulfate is small when pressurized, the minimum pressure must be maintained.

As described above, the inorganic insulating board may be manufactured by the method of manufacturing the inorganic insulating board using the magnesium sulfate inorganic binder according to the first embodiment of the present invention.

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As described above, the method for producing an inorganic insulating board using the magnesium sulfate inorganic binder according to an embodiment of the present invention, and the inorganic insulating board prepared by the manufacture of the inorganic binder with magnesium sulfate, the durability compared to the existing inorganic binder It is possible to improve and to realize high thermal characteristics.

Hereinafter, the present invention will be described in more detail with reference to Examples.

However, the following examples are merely to illustrate the invention, but the content of the present invention is not limited by the following examples.

[ EXAMPLE ]

Example 1

20 g of magnesium sulfate, 100 g of distilled water, and 10 g of silicate solution were mixed and stirred, and then mixed with 60 g of magnesium oxide and 10 g of expanded pearlite, and stirred until they were kneaded. Then, they were put into a mold and put at a pressure of 1 MPa. An inorganic insulation board was prepared by heating and pressing at 150 ° C. for 1 h.

Example 2

An inorganic insulating board was manufactured in the same manner as in Example 1, except that the amount of magnesium oxide was changed to 70 g instead of 60 g in Example 1.

Example 3

An inorganic insulating board was manufactured in the same manner as in Example 1, except that the magnesium oxide amount was 80 g instead of 60 g in Example 1.

Example 4

An inorganic insulating board was manufactured in the same manner as in Example 1, except that the magnesium oxide amount in Example 1 was 90 g instead of 60 g.

Comparative Example 1

An inorganic insulating board was prepared in the same manner as in Example 1, except that the amount of magnesium sulfate in Example 1 was 5 g instead of 20 g.

Comparative Example 2

An inorganic insulating board was manufactured in the same manner as in Example 1, except that the amount of magnesium oxide was 50g instead of 60g.

Comparative Example 3

An inorganic insulating board was manufactured in the same manner as in Example 1, except that the expanded pearlite amount was set to 30 g instead of 10 g in Example 1.

The following experiment was performed on the inorganic insulation boards prepared in Examples 1 to 4.

[ Experimental Example  One: Weapon insulation board  Thermal conductivity measurement]

The thermal conductivity of the inorganic insulation boards prepared in Examples 1 to 4 was performed. In order to measure the thermal conductivity, the inorganic insulating boards prepared in Examples 1 to 4 were prepared by using a cutter, and a 50 × 50 × 10 (mm) thermal conductivity sample.

The inorganic insulation board samples thus prepared were measured by a hot-disk method, and the results are shown in Table 1 below.

Measurement temperature (℃) Thermal Conductivity (W / mK) Example 1 25 0.08155 Example 2 25 0.08644 Example 3 25 0.08958 Example 4 25 0.08920

As can be seen in Table 1, when the amount of magnesium oxide is increased, the strength of the insulation board is increased, but the thermal conductivity is slightly increased to confirm that the thermal insulation performance is slightly reduced.

In addition, it can be seen from the results of Examples 3 and 4 that the added amount of magnesium oxide does not affect the thermal conductivity more than the ratio of Example 3.

The following experiment was performed on the inorganic insulating boards prepared in Examples 1 to 4 and Comparative Examples 1 to 3.

[ Experimental Example  2: Weapon insulation board  Strength and impact resistance measurement]

Bending strength (according to KS L5114-03 standard) and bending strength (according to KS F 3054-96) performed in the cement and concrete fields with respect to the inorganic insulation boards manufactured in Examples 1 to 4 and Comparative Examples 1 to 3 above. And impact resistance (according to KS F 3054-96) are shown in Table 2 below.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Flexural strength 30.1 30.2 31.2 32.1 18.2 17.5 17.3 Bending strength 221.5 221.9 223.4 224.5 132.2 127.4 119.9 Impact resistance clear clear clear clear Weak crack Slight crack Slight crack

As can be seen in Table 2, Examples 1 to 4 it can be seen that the flexural strength, bending strength and impact resistance is much stronger than Comparative Examples 1 to 3.

As described above, specific portions of the contents of the present invention have been described in detail, and for those skilled in the art, these specific techniques are merely preferred embodiments, and the scope of the present invention is not limited thereto. Will be obvious. Therefore, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

Claims (14)

(a) agitation step of adding magnesium sulfate to water and heating to prepare a mixture;
(b) a mixing step of preparing an inorganic binder by adding a silicate solution to the prepared mixture;
(c) a primary molding step of kneading the magnesium oxide into the prepared inorganic binder;
(d) a secondary molding step of increasing the thermal insulation performance by mixing pearlite with the inorganic insulating material manufactured by the primary molding; And
(e) placing the inorganic insulating material prepared by the secondary molding into a mold, and drying the pressurized product at room temperature after pressing;
In step (a),
The mixing ratio of the magnesium sulfate and water is 10 to 30 parts by weight: 100 parts by weight,
In step (b),
5 to 10 parts by weight of the silicate solution is mixed with respect to the total weight of the mixture,
In step (c),
60 to 90 parts by weight of the magnesium oxide is mixed with the inorganic binder, based on the total parts by weight,
In step (d),
5-20 parts by weight of the pearlite is mixed with respect to the total parts by weight of the inorganic insulating material,
10-15 parts by weight of organic acid salt and 5-15 parts by weight of blast furnace slag fine powder are further mixed with respect to the total weight of the inorganic insulating material as in the pearlite,
The organic acid salt,
It is prepared by neutralization reaction by mixing organic acid and basic compound,
In step (b),
At 50-80 ° C., mix the mixture and the silicate solution,
After mixing the silicate solution, further mix the starch solution,
The starch liquid,
Method for producing an inorganic insulation board using a magnesium sulfate inorganic binder, characterized in that it comprises gelatinized starch and dispersant.
delete The method of claim 1,
In step (a),
Method for producing an inorganic insulation board using a magnesium sulfate inorganic binder, characterized in that the magnesium sulfate and water is stirred at 50 to 80 ℃.
delete delete The method of claim 1,
In step (b),
After mixing the silicate solution, the rosin is further mixed,
The rosin amount is,
Method for producing an inorganic insulation board using a magnesium sulfate inorganic binder, characterized in that it comprises a rosin, an organic solvent and a dispersant.
delete delete delete delete delete The method of claim 1,
In step (d),
Method for producing an inorganic insulation board using a magnesium sulfate inorganic binder, characterized in that further mixing natural pearl after mixing the pearlite.
The method of claim 1,
In step (e),
The inorganic insulating material prepared by the secondary molding into a mold, pressurized at a pressure of 1 to 3 MPa and dried at room temperature, the manufacturing method of the inorganic insulating board using a magnesium sulfate inorganic binder.
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